what ontology language are you using? 

Martin,

OWL DL 1.0

I want to keep a clear distinction between entities. Thus different views of same entity are not permitted.

I only work with OWL QL, which is less expressive than than the DL fragment. But you can use one of the tools to get a QL approximation of your ontology, then materialise your Abox facts (triples) using a tool such as Ontop [1] and then compare the two sets with any of the tools to compare distance of standard dataset.

It is very likely it is not the optimal solution, but I think it will give you a good intuition of the answer. 

[1] ontop.inf.unibz.it

Thanks Martin, 

I will try Ontop.

Hi Rafael,

Thanks for pointing out the diff tools. I believe, the task I want to do can be accomplished using ecco. Once, I have the ontologies built, I will try them out on ecco web-based front end.

Thanks,

Javed