Tank for Toto Drake

[shaps]

I have a Toto C744SL bowl (elongated drake).

http://admin.totousa.com/Product%20Downloads/FT-00010,%20C744SL,%20V.01.pdf



I was going to order the ST743S tank (g-max)

https://terrylove.com/pdf/S-CST743S-1202.pdf



that Toto recommended, but saw a good price on a ST743ER (e-max)

http://admin.totousa.com/Product%20Downloads/SS-00448,%20CST744EF.10,%20V.02.pdf

I tried to reach Toto on Friday, but they were already closed. I'd like to get this thing ordered & done with. Can anyone please tell me whether or not I would be able to use the ST743ER and if I can, which one is better? Or would this not be a good idea.

Thanks!