Yes, there is and always has been a wide "spread" in the grading standards and criteria used by the numerous TPG companies. In my opinion, sooner or later, one company will become dominant around the world just as the English language has become dominant around the world. Based on the number of submissions, and the public acceptance, that it receives from all around the world I suspect that that company will be PMG. However, nothing is certain in the world of TPG, to wit the several name changes that PCGS Currency has gone through (it's now called Legacy Currency) and the total disappearance of some other TPG companies.
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" Buy the very best notes that you can afford and keep them for at least 10 years. " (Richard D. Lockwood, private communication, 1978).