No, they are not the same thing. Feral hogs are not considered game in Texas. There is no season nor regulation, but you might be required to have a valid hunting licence.
Javalinas (Peccaries) are much smaller, 50 lbs or so full grown, and are of no relation to the European pigs.
I would use the varmint rounds and aim for the ear, since you will likely get a second shot on a second javalina. If body shots are prefered I might go with a stouter bullet, but an injured jav is likely to send the pack packin'.