I don't think RAM from a 7200 will work in a 4400:
https://www.applerepairmanuals.com/the_manuals_are_in_here/Power_Macintosh_7200_Series.pdf
7200: 5- volt, 64-bit-wide, 168-pin fast-paged mode, 70 ns DIMMs.
https://www.applerepairmanuals.com/the_manuals_are_in_here/Power_Macintosh_4400.pdf...