typename vs class in C++

Is there a difference?

NO!

There is no difference. For naming template parameters, typename and class are equivalent.

typename however is possible in another context when using templates - to hint at the compiler that you are referring to a dependent type. §14.6.2:

A name used in a template declaration or definition and that is dependent on a template-parameter is assumed not to name a type unless the applicable name lookup finds a type name or the name is qualified by the keyword typename.

But, pre-C++98 only class was allowed, but that was a long time ago!

However, some people would argue that semantically it would make more sense to use one keyword over another.

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