Blower Control Module same part# different size

So it's my 1st post and I'm hoping someone will be able to help with this. A friend got me a bcm for my 89 coupe when my fan kept running even after the car was shut off. Don't know if it shows in the pics but the part #s are the same even though the replacement is about 3/4 in shorter. Any thoughts on if the smaller part is ok to use.

Thanks for any help you can give, i'm sorta new to all this.


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Blower Control Module same part# different size