Yes they are for all intents and purposes for the general user like the OP, myself and the vast majority of people.
This comparison review
of the 840 / 840 Pro 256GB details the differences between them. Yes there are a few differences, such as more durable NAND and additional over-provisioning space. However with a cost difference, the average user is not going to use the Pro in such a way as to justify the extra cost over the non-Pro version.
I kept my answer above generic because I didn't feel it was necessary to detail the minor, everyday differences which are inconsequential for most of us.
The URL to Anandtech that Weaselboy
referenced is also a good place to get details on the NAND. Plus we have a dedicated thread to the 840/840 Pro here
with lots of details on them.
Writing 10GiB per day with a write amplification of 10x to the non-pro version will last at least