There are a ton of fake ecu's out there two easy wats to tell at a glance are the height of the transistor, usally the fake ones are around 3/8" high and a real one 5/16 or so. Another way to tell at a glance is if there is printing on the transistor and also a insulating pad under it. Just two ways to tell. New ones are a real crap shoot now.

Real
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dsc00092-jpg-jpg.1715688708

mexico-jpg.1715623201



Fake
20201029_231953-jpg.1715623340
20200905_170551-jpg.1715623675
lx100guts-jpg.1715621930
20201030_153635-jpg.1715622207


Hope it helps.

The only exception I have found are the RE hi rev boxes they have a fake transistor but are about as good as you can get now.