How to distinguish between screws on MBP Early 2011

Hi guys,
recently I have opened my MacBook Pro 13-inch (Early 2011) so that I could install new RAM inside.
I followed the official Apple guideline (http://support.apple.com/kb/ht1270) which mentioned only "different size" of screws, and not where they are specifically located.
The three longer #00 screws were easy to distinguish, but according to iFixit (which I found out after changing of the memory), there were also four 3.5mm shouldered Philips #00 screws. Since I thought all of the others except the three longer ones were the same, I screwed the rest of the screws in a random order back.
My question is whether it's possible to somehow distinguish those shouldered and normal 3.5mm #00 screws? So that I could put them where they belong.
Thanks for any help.

This OWC installation video:
http://eshop.macsales.com/installvideos/macbookpro_13_unibody_early11_mem/
makes no mention of a third style of screw either.
Reseaching that name, I came up with this image of a "shouldered Phillips":
Note the significant diameter change between the threaded and unthreaded portion of the shank. See if you can see the difference among the screws. If it's not there, I'd ingore the whole thing.

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How to distinguish between screws on MBP Early 2011

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