Yes TG950/951 remain 77W and only the triangular rotation 952/953 will go 772.
Interesting if rumours are true as SK AAR states, given the comparison that SAS never really made money on the BKK route despite better flight times. I realise labour costs and the fact that they had 10 hrs of downtime for the plane in BKK undoubtedly had something to do with it, but still..