You can find the list here, at the bottom:https://shop.opnsense.com/product/dec3840-opnsense-rack-security-appliance/
For e.g. fibre, short range it specifies this product:https://www.fs.com/products/11589.htmlI don't see a Broadcom vs. Marvel option, here. I'd expect "generic" and "FS" both to work, but if you want to make 100% sure, you should probably send an email to Deciso.Kind regards,Patrick
We use "generic" modules in all our DECs without any problems.