That is a good question to ask since there is some confusion about them.
K. s. cruentatum and K. s. albogulare are similar in appearence and they can be hard (for me) to tell apart without knowing what country they are from. Both can have a lot of red or orange color on their faces and heads. Some are very pretty.
But generally speaking, albogulare gets to be much bigger with a domed carapace. Alboglare also seems to have more of a red streaked face as opposed to cruentatum that has thick stripes or blobs of red. But it is important to note that populations of each subspecies can vary WIDELY in their color, size and carapace shape.
In fact, they may not even be valid subspecies at all but rather one species that has a number of regional variants found throughout the range.
K. scorpioides is not nearly as colorful although some populations have individuals with pretty yellowish stripes on the head. Captive raised specimens can be very pretty also.
The juvenile in the post below that needs to be indentified may be a scorpioides.

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