nbt and custom_data compares differently

I noticed that 1.21 "custom_data" checks differently than nbt in 1.20 and older: custom_data strictly checks if custom_data exactly equals and dont contains anything else, while nbt checks if specified value is equal, ignoring anything else. Example:
1.21, checking custom_data for "{level:1}"
"{level:1}" returns true
"{level:1,uses:0}" returns false (should be true)
1.20, checking nbt for "{level:1}"
"{level:1}" returns true
"{level:1,uses:0}" returns true
is there any way around it?