As far as I remember this was also the plan for OMTTZA initially. The initially produced to be equipped with a foreign power pack and the next ones to be equipped with a national engines from TUMOSAN. FNSS also prepaid TUMOSAN the price for 100 engines. 450hp and 550hp engines were supposed to be tested on FNSS platforms in 2021 and in 2022 TUMOSAN was supposed to start the serial production and we see the result...Some ideas from what I could gather recently:
There's nothing to suggest that Arma II runs in the YNHZA program, unlike FNSS Alpha. FNSS directly confirmed that Alpha/Pars V was not a new design and that it had been running for more than 3 years and joined all the tests.
BMC's engine for YNHZA has been missing for years, there's nothing to suggest that it has been running on these test articles. With the revised number of first party vehicles being lower, I think first production batches will run foreign engine packs to not delay the program 2-3 more years, like Fırtına and Altay.
OKK started receiving their Pars IV with foreign engines, but no news on deliveries of the other configurations neither to TSK or the Gendarmerie.