Fuel Pump Differences

Likely a dumb question here: I'm currently helping a friend  with the Rotax 5 year replacement schedule on a 912ULS.  We ordered a new fuel pump and noticed some distinct design differences between them. I wanted to get some community feedback on the compatibility/safety/reliability of the new pump.  The old pump is likely over 10 years old.

The Differences Noticed:

• Sealing: The old pump utilizes an O-ring for sealing, while the new one does not.

• Venting/Drainage: The old pump features a nipple for a vent tube, whereas the mew one has a standard weep hole on top.

Thanks