I do not know. But knowing that WS-13E is the most recent iteration, it would be pointless to go for anything else.
I honestly would not know. I am very surprised that IK indulged Russians to the extent of visiting war memorial a day after Putin had attacked Ukraine.
Apart from helicopters & perhaps some engine tech, I do not know what Pakistan could use from Russian arms that could not be had from China? I find it perplexing to say the least. No matter what Russia does, it is a declining power and I do not think Pakistan would get much out of a relationship with Russia. There is a lot to lose if Pakistan gets into bloc politics.
Right now even RD-93MA is a big question mark. On top of an unknown delivery schedule, we have to contend with sanctions & their impact.