as they are both the same kind of bonus (circumstance) don't think it would stack.
circumstance bonus stack unless it's from the same source, here its the same masterwork crowbar.
but.. just for funsies. pick up an adamantium KUNAI. it's a simple weapon so almost anyone can use it.
Circumstance bonuses do (usually) stack:
Usually, a bonus has a type that indicates how the spell grants the bonus. The important aspect of bonus types is that two bonuses of the same type don't generally stack. With the exception of dodge bonuses, most circumstance bonuses, and racial bonuses, only the better bonus of a given type works (see Combining Magical Effects). The same principle applies to penalties—a character taking two or more penalties of the same type applies only the worst one, although most penalties have no type and thus always stack. Bonuses without a type always stack, unless they are from the same source.
As far as I know, there is no such thing as a masterwork crowbar. "Strength check to open a door" is not a skill, so there is no masterwork tool for it.
If such a thing as a masterwork crowbar did exist, I'd say it increased the circumstance bonus to +4.
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It's a dm's call if they want to allow such a thing. The masterwork tools section states.
Several common items already count as masterwork tools for particular skills. These are the alchemist’s lab, climber’s kit, disguise kit, healer’s kit, masterwork musical instrument, and masterwork thieves’ tools. Therefore, there is no masterwork climber’s kit, masterwork healer’s kit, and so on—those items are already the best available for general checks with the relevant skill.
...
Individual GMs may want to allow masterwork tools for other skills at the listed cost. The circumstance bonus for such a tool should never be more than +2. The tool should either have a limited number of uses (such as the disguise and healer’s kits) or only apply to certain aspects of the skill (such as the balancing pole’s bonus on Acrobatics checks to traverse a narrow surface or the magnifying glass’s bonus on Appraise checks for detailed items).
Since a crowbar already grants a +2 circumstance bonus, it is essentially already a masterwork tool. In general tools don't grant bonuses, tools make it so you don't have a penalty to the check. Masterwork tools not only negate the penalty but also grant a bonus. If making a strength check to open a door imposed a penalty if you attempted to do so without a crowbar, then a masterwork crowbar makes sense.
IMO I wish pathfinder had adopted d20 modern's mastercraft rules (which allows for masterwork bonuses above +2). However, in pathfinder the only way to get bonuses on an item beyond what masterwork gives you(+2 to skill checks, +1 to hit or -1 armor check penalties), is to make it magical.
