yes as stated above rtgg do have a blue tint to them somtimes , and somtimes even the average giant gourami will have some what of a blue colouration (but mostly on the fins) they probably just dyed it.
I don't know much about jardini's but they are both large fish that can hold their own and if they are not overly aggressive could probably live together , but juvenile giant g's can be very bad tempered so you might want to wait untill it's an adult (as they tend to mellow out with age)