colorscheme highlights 88 color cterms

I note that some scheme when setting highlights for
cterms use numbers in the range 0 to 255.
What happens if one is using a rxvt 88 color terminal?
Does Vim automatically map all cterm numbers from the
0-255 space down to the 0-88 space when a 88 color
terminal is being used?
Are the colors for a 256 terminal simply mangled for
a 88 color terminal?
Should a highlight have instead of 'ctermfg'
but rather 'cterm88fg' and 'cterm256fg' entries?

Thanks
Richard

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