Fortune No 1’s rendition is essentially the same as China. Same fried “guozi texture”, same paste, except they fold extra (usually you only get one egg in China) eggs outside, and they cut it for you if you dine in.
FN1:
versus a JBGZ from a Tianjin old shop, 滿天紅美食園：
Four seas and Huge tree do not serve jian bing. They serve the Taiwanese dan bing which uses d’frent batter and is sans “guo zi”, which imparts one of the essentially characters of JBGZ: the fried crunchiness. Both versions are tasty, but one must note the severe difference if on a quest to match the Serious Eats article.
Fwiw, in terms of “best” Chinese restaurant, from the amount of communists at Fortune No 1 every morning, FN1, to taste/food/price/operating times/and, if you must, speed, comes pretty damned close to the top. If it had a roll-up instead of a front wall, it could be a shop in Tianjin. And Tianjin doesn’t muck about with its baos + JBGZ.