It will be up to Thai Air if it is one ticket.. As you change plane 60 mins would be the min if it was me.
So you need to come off the inward flight, then come through the terminal for a security check at the gate.
One issue is that BKK is have work on the new Runways. Also for some reason many flights recently we have come off the plane via the stairs and take a bus back to the terminal.
The main issue your checked luggage being transferred from plane to plane.
Yes the Emirates Flight I take comes in from Dubai and it is often late by 30 mins. Bit sad really, Emirates now they have got the market share they wanted, is a pretty average out fit now. I now have reduced my flights with them and use Thai Air. Much cheaper ,ok It is 747 compare to a A380.