digital communications - Isn't Gardner's algorithm and Early-Late gate the same thing?

I'm reading about some symbol synchronization methods and I find these two (ELG and Gardner) very similar.

Early-Late gate takes 2 samples, one at $t=T-\delta$ and the other at $t=T+\delta$, then from that you get the timing error; Gardner takes also 2 samples for $\delta=T/2$, one at $t=T-T/2$ and the other at $t=T+T/2$.

I can't really see the difference between these two, although there must surely be a few. Could someone explain that to me?

Thanks.