I would contend that it depends on a lot of variables that the OP has not provided before an accurate answer can be given; size of rack (6qt? 28qt? 41qt?), set points of rack, differential within the rack, etc...
I have a pair of GBKs. I was able to easily house them in the bottom tier of a 12 tall x 4 wide 41qt rack system. This did not provide any stress or challenge to the animals because: 1) I run my hot spot about 3 degrees lower than most ball keepers (30 versus 33), 2) the temps at the bottom of the rack tend to be lower than they do at the top of the rack, 3) the depth of the tub offers a wide degree of gradient, 4) I also run my ambient a bit lower than most.
All of that together makes it easy for me to house the GBKs in the same rack as the balls. Because I know the parameters and the tolerances of the animals.
Would I try to house an adult GBK in a 6qt baby ball rack running a hot spot of 33 with an ambient of 28? Not for one second!
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