Bosch CIS fuel pump cross reference

[speedo]

Did a search, but it was inconclusive.

I have two stray Bosch pumps, 580 254 991 and 580 254 984. Looks like both are CIS pumps with 165 L/H flow.

The factory part number for the pump in my car is 580 254 988.

Can either of these pumps be used as a backup for my existing pump?

The cross references are not clear, so if anyone has a good Bosch cross reference, I would sure appreciate a link.

TIA
Speedo

[boyt911sc]

I've been using FP-984 for SC engines. If the -984 FP is good, you could use it as spare FP for early CIS engines.

Tony