They are same with skateboard bearing and longboard bearings. Weather the size of your  longboard wheels and  skating roller wheel are different ,you can use same standard 608 bearings, there is only one point you need to care is the dimension of the bearing spacers.

There are two different dimension 8mm and 10 mm ,normally 8mm can be use fore all skater wheel ,longboard wheel .

If your longboard wheel is much bigger ,you may be need with the 10mm bearing spacer ,you can measure your wheel space total width .

And for longborad wheel bearing application ,you can choose built -in spacers bearing as below picutre ,these bearing with inner ring extended can assembled with wheel well and it can make your wheel running more fast.