Ilfosol S = Xtol?

In a recent question regarding Diafine, I noted one of the responses referring to Ilfosol S as Ilford's version of Xtol. I've tried Xtol several times at higher dilutions with good results (HP5+, and FP4+), but am curious about Ilfosol S; that is to say, is this developer chemically similar to Xtol? The Film Development Cookbook makes no reference (that I've found) to any similarities between the two, but perhaps that is because Ilfosol S is a more recent product than the print date of my book. Any input would be appreciated!

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