The Jo-Han Olds 4-4-2 funny car pictured is a '71 (AMT didn't get that one), the Hornet funny car is a '74 (AMT's version was a '73), and the Jo-Han Toronado is a '66.
Jo-Han kept the Toronado for themselves in '66. AMT issued the Jo-Han kit for '67; it wasn't 100% correct (MPC had the '67 promo, and their kit was the more accurate of the two). The Jo-Han kit was again updated for '68 (and was again not 100% correct; MPC still had the promo contract). Jo-Han got the promo deal back for '69, and issued the Toronado kit in Jo-Han packaging. For '70, the Toro was issued by AMT. I'm not sure if Jo-Han offered it in 1970 also, though they did (re)issue it as a USA Oldies kit in 1975 or '76.. The '71 and '72 kits were Jo-Han.
AMT sold the two-seater AMX kits in '68, '69, and '70. They were not sold as annual kits in Jo-Han packaging. The '69 and '70 AMX kits were sold by AMT in two different boxes in each year, with different stock numbers. Jo-Han backdated the AMX to '69 trim and offered it as the Shirley Shahan Super Stocker in 1971. The original issue of that kit has a number of differences from the Eighties reissue. The '69 AMX was issued as a USA Oldies kit. All of the Jo-Han '69 AMX kits have the 1970 interior bucket, and like most post-1966 AMC kits, have the 1956-'66 first-generation V8 engine.
AMT sold the Jo-Han Olds 4-4-2 kit for 1969 and 1970; like the AMX kits the 4-4-2 was issued in two different boxes for each year. Unlike the AMX, Jo-Han also issued the 4-4-2 in its own packaging alongside the AMT versions. Jo-Han kept the 4-4-2 for itself in 1968, 1971, and 1972. For 1971, Jo-Han offered two 4-4-2 annual kits: stock or Pro Stock, and funny car only.
The AMT-boxed Jo-Han Hornet funny car was a '73. Jo-Han sold Hornet funny car "annual" kits every year from '70 through '73. The pictured '74-bodied kit was issued in the late Seventies, well after it could be considered an "annual" kit. Why Jo-Han didn't issue the Hornet with a stock version, or even as a snap kit later, is beyond me.
Other AMT-boxed Jo-Han kits include the '72 Torino NASCAR (MPC offered one too, but it was a different kit), '70 Challenger funny car, '71 Mark Donohue Trans-Am Javelin/AMX (Jo-Han sold the '70 version), and Maverick Pro Stock. I believe the Challenger and Maverick were the last two Jo-Han kits offered by AMT.
The AMT 1970 annual kit announcements included a Cadillac Eldorado (which certainly would have been a re-boxed Jo-Han kit), but the AMT Eldo never appeared. It would have been the first full-detail AMT Cadillac kit. Jo-Han never made a Chevrolet, AMT didn't offer a Cadillac (until the Escalade EXT, years later).
There is probably no one still living who could offer some insight as to which company initiated the kit-sharing deal, why some kits were shared and others weren't, and why the deal ended. It would have been interesting to see some other Jo-Han kits in AMT packaging...the AMC Javelins, the stock '70 Maverick, the Mickey Thompson funny cars, the Sox & Martin Barracuda, the USA Oldies series...