Notice the 3s are different too. Were I to make a "blind" guess, I'd say that the simpler they are the newer they are, based in the tendency of modern mfg. Which would mean the serif G is earlier. If I had to draw a line based on available information, I'd say the serif G was Easco circa 1986 or earlier.
While it is often said that Danaher took over Easco in 1990, that's not the only delineator. Wiki reports: In 1985, Easco Corporation was acquired via a hostile takeover by Equity Group Holdings, controlled by the investment brothers Steven Rales and Mitchell Rales and taken private. In 1990, the hand tool company was acquired by the brothers' Danaher Corporation. So the "Danaher Brothers" actually took over in 1985. The 1990 acquisition by Danaher was just a paper-shuffling deal. So the brothers controlled Easco back in 1985.
The brothers made some tool changes as early as 1986. Two examples are the elimination of the single-V code and the final elimination of the oil port on the 1/4" teardrop ratchets (the larger drives were changed back around 1978).
Another indication as to chronological order is that (IIRC) the later upside down G and the numbered G (G1, G2) are all the rounder, non-serif font.
So I'd bet the serif G is pre-brothers.