Generally, older products with an 'HE' prefix will usually only work with other 'HE' products. Similarly the current 'SH5' coded products will usually only work with other 'SH5' products from the range.
On occasion however, there is a crossover whereby some compatibility may occur between the two types, albeit this is more of a coincidence than design.
Common compatibility questions:
Please refer to the technical support teams to check for compatibility between your new and older devices if in doubt.