Main differences.
RTG originally from Indonesia
Gold coloration to 4th level
Price is a lot cheaper than Golds.
Golds / Malaysian Golds / Xbacks orginate from Malaysia.
Gold coloration crosses over their backs (6th level) completely from left side to right side
More intensive coloration of base colours
Premium price can be very expensive.
HB RTG (High back) which is a cross between an RTG and a Xback.
It has gold shine to the 5th level of scale
Price is a little more expensive than your regular RTG
What you get and what the certificate says, does not always end up being the same. sometimes you can be surprised, sometimes disapointed.
There are many different sub groups in the above colour variations.
The one in your picture is an RTG possible HB RTG with some small specs happening on the 5th level. hopefully it gets full shine on 5th level.
Very nice example of RTG.