I'd kind of agree with Larsinger58
I'm not sure of the exact time scales involved for the whole story, however it is possible new cattle were bought or birthed (although this might not be possible due to the time of year\timescale), between the two events in question.
If we are looking for 'gotchas' in the bible, I think there are more compelling ones than this. IMHO where a literalist feels they can defend an example of alleged inconsistency they will count that as a victory and it will reaffirm their beliefs.