There is no difference as far as my understanding goes.
'Although' is preferred at the beginning of the sentence
"Although we were late, we were still able to have a good time."
"He had a good time, though he hit his head while he was there."
Note that you could have said.
"Though we were late, we were still able to have a good time."
The use of 'although' at the beginning of a sentence is a preference, not a rule.