Depending on the version, imac G4 TFT uses PC133 144-pin SODIMM, PC2100 200-pin DDR SODIMM or PC2700 200-pin DDR SODIMM, while, again depending on the version, emac uses PC133 168-pin DIMM or PC2700 184-pin DDR DIMM.
While emac uses DIMM, imac G4 TFT requires SODIMM (laptop form-factor...