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No I am not aware of any similar varieties, but I am certainly not an expert.  And there are so many tomato varieties 'out there', it is difficult to be across all or even most of them. 

I love the various Sosulka, aka Icicle tomatoes and this green one fits right in with them.   

If you get that same intense flavour in a larger salad tomato, Jang, it is definitely worth following up. 

The Early Prolific Straightneck has definitely reached its final size and has changed colour to a dark yellow orange.  So it came in to post harvest mature its seeds.