The volume from the vinyl is determined by the output of the cartridge and the gain of the phono stage. It is highly unlikely that for a given combo it would exactly match the output of a given CD player. Depending on the equipment involved the vinyl could just as easily be louder than the CD.
This is a non issue as long as you can turn the vinyl up as loud as you want.
This is a non issue as long as you can turn the vinyl up as loud as you want.