The system requirements for all iWorks versions:
• iWork: System Requirements - note 2013 version: does not over-write iWork 09
so the newer and older may (appears to) be able to run in the same computer...
Not sure how a situation like that would affect files, usually the older would be
converted to run in the newer version if directed to be opened by new version.
But, it would likely not open in the older one again. - If needed make duplicates.
Is there a reason why you chose to need a 2010 model MacBook Pro?
Mid 2010 model w/ 13-inch display, example: shipped new with one of these:
•Original OS Mac OS X 10.6.3 (10D2125)
•Later OS Mac OS X 10.6.4 (10F2108)
{update to 10.6.8 is Combo download. If unit is upgraded further, you need OEM disc}
- on DVD factory grey install restore media + included several applications -
The 13-inch model may be among those more stable; certain 15-inch
build models, due to dual-graphic capabilities, may have issues. And
the 17-inch model is desired for its larger display, not matched in size.
And the largest seems to hold values a bit longer, depending on market.
Most 13-inch models that can accept additional RAM memory upgrade, after
the Mid 2010 model, (until Mid 2012 13-inch non-retina w/ optical drive) can
use 16GB RAM; earlier ones see only up to 8GB memory upgrade. More recent
cannot be upgraded due to factory affixed memory RAM soldered to logicboard.
You could look into everymac.com to see cross-section of most all specifications;
macsales.com sometimes has quality guaranteed refurbished portable macs; on
occasion, powerbookmedic, wegenermedia, and other long standing choices may
have repaired or refurbished models for resell, with in-house limited guaranties.
If you have an Apple User Group in your area, perhaps someone there may have an
older MacBook Pro unit in good shape, with accessories (box, is also nice) or know
of a reputable sources for previously owned models. Some individuals may be able
to tell you if any other group may have one to donate. People upgrade; some move
and don't take the old model with them.
If you buy a used computer, some of this may already be done by owner:
What to do before selling or giving away your Mac - Apple Support
Be sure whatever older model you get, has install restore discs that were associated
with its function, included; if the unit is running Snow Leopard 10.6.8, especially.
The path to restore main system offline is important, later ones use Internet for it all.
Good quality backups can help restore your updated system, on daily basis.
In any event...
Good luck & happy computing!