I'm not sure what you're saying, but yeah I do think there's a difference. Can't be sure to classify them all at this stage, but I find the 3D ones tend to be more adventurous.

To give an example, ISFp's (4D Si) often are content with the same - for instance lounging on couch eating familiar food watching TV

ESFj's (3D Si) more inclined to create new recipies in kitchen, more inclined to go to new restaurants and stuff.

So maybe something within the phrase of calling the second function, the "creative function" overall (thinking of all the types).