Is it slipping? What are you measuring the pressure with? Oil pressure senders and gauges are not super accurate. If you're getting 115 and the low end of the range is 120, that could easily be within the accuracy of the gauge. Maybe the better question is how low can the oil pressure be before the transmission starts slipping.
Transmission oil pressures don't need to match. Either the transmissions slip or they don't.
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters