In looking at the parts breakdown that Sundown posted for the TA1515 it does appear that central port block is common for either CW or CCW rotation so should only have to change vane pump.
Been 20+ years since I did that job. Not difficult but I don稚 remember the exact process.
even if I had to replace that one it wouldn't be the end of the world, it's not all that expensive, and having a new pump there would be a big plus too.