dirt road84483,
Yes we have two recommended BOM values, one for 315MHz and one for 433MHz. Both builds are based on the same PCB, but with two different sets of components values. We have many customer using this approach very successfully and it is what I would recommend you doing.
However, if this is not an option. I would recommend start with the 433MHz design and see if the circuit performs ok at 315MHz. You will get some performance hit and it is up to your system requirements to evaluate if that is acceptable.
Regards,
/TA