Differences:
The difference of the number of rows in the datasets is 12.
In IAM dataset, 12 rows have merely information on division, nothing else (those are 4562, 14612, 14613, 15076, 15539 - 15543, 22267, 29888 and 31545).
For two games
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2013-10-5, Brighton vs Nott'm Forest and
2009-12-26, Cheltenham vs Bournemouth)
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none of the statistics numbers coincide.
Even more, BCA numbers for the said games look fabricated - first four statistics columns are equal and in the last three columns, instead of usual decimal numbers, there are consecutive integers (i.e., 2, 2, 2, 2, 1, 2, 3 and 3, 3, 3, 3, 3, 2, 1).
Pity it took me more than hour, got carried away a little.
Nevertheless, thank you for the practice.
Edmunds