The GT-10B has 5 EQ's on hand.
One each in FX1 and FX2, but we won't worry about those.
There is the main EQ effect which is moveable anywhere in the signal chain,
a patch Master EQ at the end of the chain,
and a global EQ at the end of the chain.
The global affects all patches, but is only a simple low/high and a parametric mid.
The Master EQ works the same, Low/High, and parametric, but is configurable for each patch.
The main EQ effect has low/high filter cutoff and boost/cut, and two mid parametric, each with Freq, Q, Gain.
the main EQ is also different for each patch.
If you want the same EQ on each patch, you can use the limited feature Global EQ found in the 'System' settings, or use the main patch EQ and set it for each patch.
An easy way to set the main EQ same for each patch, using the GT-10BFxFloorBoard editor software
GT Fx FloorBoard - Browse /GT-10BFxFloorBoard at SourceForge.net
Copy the patch into the Main screen clipboard (Temp1~Temp5), then from the EQ effect page, use the 'Bulk Write' feature to Write the EQ only settings to a defined range of User patches in the GT-10B