Can't imagine those aircraft joining the CX fleet as they would need a complete cabin refit to align with CX mainline 2class or 3class config.
It's quite an easy process to swap cabin interiors between aircraft.
B-HLE will be the start with cabin removed and then given a service and mods as KA require.
First B-HWx will be schedule in for cabin removal to be fitted to B-HLE and so on.
I have read that the galleys may remain so a slight config change for the girls.
Other than the No.3 door being a smaller type on the ex CX aircraft the brake cooling fans would be missed on the short hot transits.
That would be quite a large modification if carried out to include brake fan replacements, I suspect not..
TW