To the best of my knowledge Testors never produced kits of their own. They just reissued other manufacturer's offering under their label. I know they have issued Fujimi, Italeri, Gunze and JoHan kits. If I get a chance I will post some photos of the 934. From what I remember it is a nice curb side kit.
The 914 will be a reissue of the Revell kit. However it is supposed to include the racing windscreen from the Richie Ginther version along with all the street car parts. Originally the race car version and the street car version were separate kits.