Will transmission automatic 1.6 fit on 1.8 motor,is similar bolts pattern

You mean FIT And actually WORK right. (its TCM shifted, so fooling it will be a problem)
ask suzuki that????
or any wrecking yard, (they use and pay for, 'Hollanders data base") ask them!
http://hollanderinterchange.net/

i have the the full parts list on esteem.
so will see if the pn is near same. 1995-2002 is range
1.6L is the G16 engines
the 1.8L is the J18 (and understroked, J20)
the are apples oranges different the latter is chain drive, twin cap.
G16, is belt drive and 1 cam.
it looks like it fits, but the suzuki partnumber fail. for whole trans.
g16 is p/n is ~65g30
j18 IS P/N IS 65g50
THE j18 Has many different parts inside, the valve body and TC clutch, are not the same
the J18 has like 45more HP. so... that can matter big time....
you do know the 2 boxes have 100s of parts
i have the p/n, on each but take me all day to compare 100 agains, 100 more.... and Im not doing it.
on our Vitara's , RWD Trackers, the j20 trans bolts up to the old G16
but the things behind it dont fit. for sure the mt clutch)
on a/t trans the clutch is different and the flex plate.
I'm no FWD expert, id not own one, Im RWD 100% 4wd.
but there a number of great forums that cover trans swaps.

that is all I have on this.