Both the original Tekton Type 1 font family and the current Tekton Pro OpenType CFF font families are Adobe Originals for which there was absolutely no outsourcing to “a different foundry.” And the Tekton Pro OpenType CFF font is absolutely no different than the same font family in the Font Folio product or available for licensing via FontSpring.
For many if not most of the transitions from Type 1 to OpenType CFF, Adobe did make some adjustments to metrics, glyph complements (adding but not subtracting), and some letterforms. Part of the discussion with regards to how we named the OpenType CFF fonts revolved around the fact that some changes were made. My argument (which prevailed) was that if we named the OpenType CFF fonts with the exact same names as the original Type 1 fonts, the expectations would be that everything (other than added glyphs) would be exactly the same moving from Type 1 to OpenType CFF. If that expectation was not met, we would have some very angry customers. Thus, the OpenType fonts had Std or Pro as part of their family names, the difference being the glyph complements.
I personally don't recall any dramatic differences in metrics that you are reporting, but then again, I never used long runs of Tekton in any of my documents, either before or after the migration to OpenType. 🙄
One other considertion in terms of metrics. Metrics for OpenType fonts are stored in the font itself. The metrics in Type 1 fonts were stored in separate, operating system-dependent files (.pfm for Windows and in the so-called “screen font” for MacOS). Differences in font metric units may account for some (but not very large) variance as well. Even if you “convert” Type 1 to OpenType CFF, you may find some metrics discrepancies.
No matter what, you really need to check your documents after making the font substitutions.
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