I'd definitely call bullshit on your friend (i.e., "test the same as pharma Adderall"). No one is going through the effort of formulating a pressed adderall pill with the same ratios of dextroamphetamine to amphetamine found in adderall, particularly formulated in the same variety of salts (saccharate, aspartate and sulphate, and as a precise mixture of enantiomerically pure and/or racemic amphetamine). The best you'll get is likely just racemic amphetamine.
But far more common is simply methamphetamine. I've tried the methamphetamine presses and feel like they contain somewhere between 15mg-40mg of mexican dextromethamphetamine. Though I've had a few "spicy" ones that felt way stronger than others (even in the same batch), so the consistency can definitely vary. I've had instances where a few pills consumed didn't impair sleep too much, but there was a case where I took a single pill (same "batch") at 10am had couldn't sleep at all that night. So the quality control isn't great.
The following test results show that an overwhelming majority are meth, and I'm guessing many of those that tested as "amphetamine" were likely pharmaceutical adderall (since drugs data doesnt test for enantiomers). I think it's only been a more recent development to find illicitly manufactured amphetamine being sold in pressed adderall, but I have heard that this is occurring more these days. Still, none of said amphetamine presses will be the "same" as pharmaceutical adderall in terms of ratios of enantiomers and variety of salts:
Note, one of the samples submitted contained fentanyl, but apparently not much, based on the description. The oral bioavailability of fentanyl is quite low too.