M40 AFM Compatible with M42?

[DC123]

My M40 engine in my e30 suffered irreparable heat damage to the engine block so I decided to replace it with an M42 from another e30.
Unfortunately due to some miscommunication the engine dealer did not ship me the M42 Air Flow Meter (M42's are rare in Australia and he is in another state).
He's now offering to ship it for an additional fee, but I'm wondering if I can just use the AFM from my M40?

The M40 AFM looks (to me) identical to the M42 unit, but some research reveals that the M40 uses Motronic 1.3 while M42 uses Motronic 1.7.
The AFM's have different part numbers, but after an extensive search on the internet I can't find definite proof that they cannot be used interchangeably.

Can anyone help me clear this up?

[DHFiS]

Looking at the list on RealOEM it shows the same part fitted to the E30 M42 and E36 M40

http://www.realoem.com/bmw/partxref.do? ... series=E36

[MrWhite]

I've been using an M40 AFM on my M42 without any issues for over a year now. One thing I will say is that the M40 AFM came from a CAT engine and so has the mixture adjustment screw on it where the M42 one was blanked off. I've never properly readjusted it since fitting it and have noticed that the hydrocarbon emissions from the last 2 MOTs are slightly higher - still within acceptable limits but only just.

[Jos]

Yup, works fine. If you are using lambda then you need to disconnect pin 3 (there is a connection on the bulkhead wiring for this). Confuses the hell out of the engine if you have it connected with lambda.

[DC123]

Thanks for the replies.
Think I'll take a wait and see approach and assume it will work.