[gradsusr] Operation error: Incompatible grids

[Alauda arvensis]

Dear Grads users,

I have two grids (.nc) from two models covering the same area and time but
with different spatial resolutions.
When combining variables from both grids (e.g. T_grid1 - T_grid2) I receive
"Operation error: Incompatible grids".
I assume this occurs because both grids have different spatial resolutions.
How can I fix this?
Thank you very much in advance.

With kind regards,
Chris
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