The thing that makes Testors orange tube glue work is that it contains a solvent, toluene, that partially melts and fuses styrene plastic together.
The blue tube stuff, in order to be called "non-toxic", basically eliminates the toxic part (the toluene, the ingredient that makes the glue work) and substitutes citric acid instead. In other words, the blue tube stuff is missing the very ingredient (toluene) that makes the orange tube stuff work! Bottom line: the blue tube stuff can't possibly work as well as the orange tube stuff.