[Question about synchronous transfer] Will this kind of transfer cause problem?

I know for any asynchronous data transfers, we would need special handling mechanisms (i.e double sync, FIFO, handshaking, etc). I have a design that where the core logic interacts with the LVDS TX IP block using 2 PLLs. The launch clock (that feed the core reg) is from the 1st PLL. The latch clock (that feeds the tx_reg from LVDS) is from 2nd PLL, but is also sourced from the first PLL. These 2 clocks have the same frequency but different phase. In this case, is this kind of transfer still considered synchronous or will it run into metastability issue despite meeting timing requirement in TQ?