Rol -
The styles are different in the EXR and GW, but I cannot tell you exactly how different.
The GW keys are very tiny, almost like an accordion (short).
The EXR7s keybed is very nice. I think the keybeds in the EXR's might all be the same.
Also, the EXR7s has 76 keys and is still lightweight.
Regards,
zuki
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Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand
Studio: Korg PA4X/Yamaha DGX670/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/K&M stand