Remote Function Module call from ECC to CRM (how to pass parameters?)

Hi there,
I have a remote FM that I would like to call from ECC to CRM. The FM is remote-enabled, so I assume that I can call this from CRM. However, in CRM some of the table structures that is required are not available. Hence, my export/import parameters won't be match, unless I create those types in CRM, but this is going to major work!! 
How do we pass/import the parameters since the data type in ECC is vastly different/not available in CRM?
Cheers

The structure will need to be defined in CRM.

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