VBA to select similar coloured cells from a range

I've got an image i made into pixel art in excel, but some of the cells are just slightly off the colour i want them to be, so i was wondering if it was possible to select all cells that are within a certain colour range?

E.g. the range of the pic was already set and I want to be able to use the colour in the active cell to select all the similar coloured cells in the set range. E.g. the colour i want is 6468036 but some of the cells I want to be that colour are 6665928 or 6991299 if that makes sense?

Can anyone help with that please?

Let's assume we define similarity as any of the 3 components (RGB) not being different by more than 10) from original value. (in your examples maximum difference is 8).
Then one can use a macro as in attached file

select cell F3 and run macro. note I3 remains unselected

select H3, run macro, and note all cells are selected after a macro