They're absolutely not, though.
Someone who came up 100 times with runners in scoring position and got a hit 80 times is significantly more valuable than someone who came up 400 times with runners in scoring position and only got a hit 100 of those times. The fact that the first player may only have 60 RBIs and the second player may have 175 RBIs - and people valuing the 2nd player over the 1st - is the issue with RBIs, whereas BA with RISP would show that the first player had an 0.800 BA with RISP while the 2nd player had a 0.200 BA with RISP.
Yes - but with different meanings and interpretations.
I'm really not going to have this debate. It's an interesting stat, but basically any research I've seen on the topic shows that BA with RISP has little to do with determining a player's ability to create runs and it's not in any way a significant meansurement of a player's value. You can do your own homework here. I'm not doing it for you.