Is there a way to figure out how to find the canonical channel listings that MCE uses?

 So I have HDHR and the zap2it.com listing for History International on the zap2it.com site is HI (zip code 95002, channel 276).. however on MCE listing it as HI is incorrect and will not download the guide data for that channel. I found out from another friend that his MCE lists it as HISI instead, which works and now I get data for that.

My current problem is there is a new listing for SYFYHD (channel 736) which unfortunately has different program listing from SYFYP (chan 73), MCE will list SYFYP data if I code it to SYFY which again is not the same as zap2it but it works. Unfortunately the program line-up is totally different than SYFYHD and coding the channel as SYFYHD won't download it's listings and I cannot find the name MCE will recognize to download SYFYHD episode programs..