Hello,
Welcome to FixYa.
This is a common complaint following a drain pump change out, particularly when one has an older Bosch and installing the new style/revised outlet pumps.
If you still have your old pump or if you recall observing it, that design usually only had 4 vanes on the impeller to pump the water.
Since then however, Bosch has re-designed their drain pumps to allow them to be "quieter" hence they now have either a 6 or 9 vane ( depending on model ) on the pump impeller, so yes they are much quieter but as a result pump less water in the time allowed.
example...
...So to answer your question it likely is normal and should be of little consequence. but if you`d like you can still get the other style, you just need to know what to ask for but is quite often "special order". Part # 184178.
NOTE - If you live in the Northwest region of the states ( Especially Washington ) often installation for dishwashers include what is know as a "Johnson Tee" air gaps in the wall.
**Johnson Tees were designed for older dishwashers with 1/2” drain
tubing and work better with stronger 4-vane drain pumps (# 184178) instead of
the current quieter 6-vane pumps (# 167082). In homes with Johnson Tees, use
only 4-vane drain pumps (# 184178).**
Hope that helps, let me know if I can assist you further and good luck.
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macmarkus :)
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