Do not think it is going to be C28A because Pakistan Naval requirement is of 3200 to 3600 ton displacement. So the new F22P would have to increase its size and accommodate surface to air weapons but be smaller and less expensive then a destroyer.
Not sure if Algeria Naval personel were trained here may be Sir
@Arsalan ,
@fatman17 ,
@Rashid Mahmood can answer.
Chinese sources suggest it is an evolution of Pakistan's F-22P on the basis that Algerian naval teams visited Pakistan to see that frigate's operations first-hand. The C28A also appears to borrow design elements from the Type 054A frigate of the Chinese People's Liberation Army Navy.
taken from this article...
First Algerian C28A corvette launched in China - IHS Jane's 360