What is the difference between the LT1054 from TI & the LT1054 from Linear Technologies, other than price
No. Parts with the same part number should have exactly the same specs, even from different vendors. This allows for second sourcing, which makes it more likely that the part will be included in a design since there is no longer a dependence on the original vendor continuing to manufacture the part.

This doesn't mean that all vendors need to price them the same way though. If one of them has an advantage in manufacture then they are free to take advantage of that (unless there are licensing terms that say otherwise).