Should there be the same clearance between the fender and top of tires on all 4 of them

Yes, ..BUT.. There are a couple issues that must be considered..
Front end first.
1. Clearance = at the fenders when the suspension moves the tires to max travel upward... == 2. When the tires are turned full travel left and right ( full suspension travel also)..make sure the tires will clear the frame/suspension components (at full turn - left and right)
Next is the front end geometry (toe-in -caster/camber) is set after you install the new tires... larger tires will also decrease your milage (harder for the engine to turn).. REAR END - make sure the tires clear the fenders when the suspension moves through the full travel range.. if the tires stick outside the fenders, you MIGHT have an issue at full suspension compression.. not to mention throwing "stuff" all over your truck!

check you have all same size tyres, factory stated, check shocks.

Per Tire Rack, for a 2001 330ci you could use 235/35-19 front and 245/35-19 in the rear. Wider tires for the same profile increase the tire's effective diameter(think wheel well gap above the tire) and will change both the odometer and speedometer readings. Additionally, the wider tires may cause rubbing of the fender or other components while turning unless the fenders are flared out.
Caliper clearance should be checked, usually M3 uses bigger calipers than stock. While they may look cool installed, there are several disadvantages to lolwer profile tires such as harsh ride, unforgiving of potholes/speedbumps, wider width is worse for snow application (cause that floating feeling). The 2008 wheel will have the tire pressure monitoring system (TPMS) .
Both have a bolt pattern of 5-120.

The wheels sound like a multi-fit, they have 2 different bolt patterns. chances are they will fit - try one one the car and make sure you have clearance both outside on the fender and inside with steering items and brake parts. Also make sure there's enough tire clearance when turned lock-to-lock when the suspension is compressed.

A 185/70r14 is 24.19 inches in diameter a 195/65r15 is 24.98 inches in diameter. So you are almost an inch taller and would probably have some issues with the tires rubbing on the inner fenders.

The other issue is that you will need to buy 15 inch rims.

Thats a tall tire but it depends on the size tire/rims that are on it. I have a 91 taurus that has 14 inch rims, the only draw back on taller tires are the fender wells, make sure the tires do not rub the fenders. especially the front, if you put them on, turn the front wheels to the left, then check to feel or see that they do not rub. then turn wheels to the right and recheck for clearance. good luck, if the fit and clear.

The fender is bolted to the frame on the top, front, bottom and also at the rear, by the door. Just loosen all the bolts holding it on, pull it off and put the new one back on with all the same bolts. Also, the top bolts on the fender are hex type bolt heads.

Hi,the 255/55R/19 is just a little taller ( 3/4--1" inch.) than the oem tire and should not be an issue to use, i took the 16" rims & tires off my 99 f-350 truck and put 18" rims and tires from a 2008 f-350 on it ( the dealer said they would not even bolt on!! but they bolted right up with no issues,and they improved my ride tremendously.) as long as you have enough clearance between tire and fender it will not be an issue at all. yz-maniac.

Probably not the way to tell is measure the circumference of your wheel [22 inch] with the total hieght of your tire add the two and the measure the clearance between the top of your fender to the ground and keep in mind turning distance of the wheel and tire between the fender...

i have a 2005 and went to a higher profile tire. nothing but good things have come from it. better ride, better gas mileage, and an all around nicer look. do not go to drastic but the next size up as far as sidewall goes...i am happy with my choice.