That's a bit trickier for me to answer. Unfortunately, I believe the mac flash was done to stop conflicting sensors between the MacBook and the hard drive sensors. They may have also updated the firmware, in essence fixing two issues at once.
You may be able to force the Apple's own flash that was released onto your drive if they follow the same routine, but I'm not sure of their exact routine and utility. Basically the force flash of the Dell firmware was to bypass an annoying check to ensure that the drive was actually bought from Dell. If Apple has implemented this same check, only the their P/N codes, then you'd simply need to use the appropriate switches in the same sequence as done here.
Hopefully someone who's actually dealt with Mac can better answer your questions. It seems like the flash would work regardless, but you never know how different manufacturers write their code to read from the drive. You may, as was my case, be in a situation where you're fed up and just want to either flash or buy a new drive that isn't plagued by shotty code.
I backed up my drive, rubbed my lucky rabbit foot keychain, and let the force install do it's thing. In the case it failed and bricked my drive, I would've simply bought a WD640 for my laptop, rma'd the ST9500, and then sold the rma'd drive on ebay. If you're fed up like I was... perhaps that's the way to go. You may however try to do the flash in a Windows machine if possible (just hook it up, flash it, and then move it back to the Mac) to perhaps avoid some complications in the flash, but this may be futile and still brick the drive... your best bet is to use a supported Dell, but that means you need some connections...
Basically... best of luck and hopefully someone that knows more about Macs will come on here... but if not I gave you a few options hopefully in the worst case scenario.
Let me know if you have any other questions.
