https://en.numista.com/catalogue/pologne-lituanie-1.html shows zloty to thaler ratio as
---
First Zloty (1573-1795)
1 Thaler = 8 Zlotys = 240 Groschens = 720 Kreuzers = 4320 Deniers / Hellers
---
During times of Stephen Báthory (1576-1586) groschen had fine silver content to fit 1/36 thaler. Compare N#63418 and N#98946 . Lower nomination coins were billons.
Sigismund III Vasa (1587-1632) was releasing 3 groschen with same silver content as Báthory.
John II Casimir Vasa (1649-1668) groschen had indicated value of 1/90 thaler after 1660. See 30 on 3 Groschen coins or 60 on 1½ groschen/3 polker. Early 3 polker coins still had 24 making early ratio at 1 to 36. First zloty coin was at ⅓ thaler.
According to Numista Augustus II the Strong (1697-1733) tried to get country back with 1/24 thaler to groschen ratio, but I suspect that I am looking at other instance where people put coins from wrong country in their branch.
I suspect that the only ratio that persisted was 1 Zloty = 30 Groschens = 90 Solidi / Schilling / Kreuzers.
Maybe do not display thaler ratio as it tended to follow mass that was outside of country's control.