Thanks for your inquiry I am representative of Aspose.Words team.
The latest version of Aspose.Words for JAVA is completely auto-ported from .NET; i.e. we do not write code for Aspose.Words for JAVA. It is generated out automatically from C# code of Aspose.Words for .NET. So, there should not be any significant difference in functionalities between JAVA and .NET versions because the code is mostly the same.
Same is the case with Aspose.Cells for Java. The new version of Aspose.Cells for JAVA is completely auto-ported from .NET. So, there should not be any significant difference in functionality between JAVA and .NET versions of Aspose.Cells because the code/API is mostly the same.
There is not any significant difference or issues/limitations comparing Aspose.Cells for Java with Aspose.Cells for .NET.