Actually, Jim, the .30-06 and 7.62 x 51 guns do not use the same link. The 7.62 models use a slightly different link that does not have the "belling" on the small end of the loop. This is due to the different shoulder angle on the 7.62 cartridge. I use both and have a 1919 set up for .30-06 and one set up for 7.62 x 51. I don't take both out at the same time after mixing up several thousand links!
You CAN use the same link but the 7.62 will push too far into the link causing feeding problems.