Goals scored in penalty shootouts never count, and for good reasons. Those goals are not based on performance, and the chance is "awarded" automatically when extra time finishes with a draw.
But penalties in normal time do count and they're essentially the same. I suppose it's something that can't be 100% consistent but I definitely agree that shootout goals shouldn't count.
Penalties in normal time are not given out automatically. It is earned, at least in theory. A team needs to have conducted an attack worthy of being irregularly stopped by the opponent's defense in order to be awarded a penalty.
I know f.a. about English football, and not much about the sport in general, but all the sources I checked listed Camsell as having 18 goals, which would put him right in there with Dean, Haynes and Hunt.
The problem with comparing modern footballers to their predecessors is the large number of other variables involved. Chiefly, that modern international footballers will play many more games between major tournaments, (often against inferior opposition) than they used to. Advances in technology (lighter ball construction, boot improvements etc) rule changes and modern tactics all contribute, as do the vastly different fitness / training regimes. Previously, players would often reach for a smoke with their orange wedge at half time! Finally, penalty kicks are awarded so often now that these sometimes represent a sizeable portion of a player’s total count, to my mind diminishing the accomplishment (not mentioning Kane or anything). In this context, Jimmy Greave’s haul might be seen as more impressive.