Going from Guarani to Tagalog (Filipino) has a composite linguistic distance of 70% (heuristic estimate). Below is the dimension-by-dimension breakdown.
Shared vocabulary, cognates, and loanwords.
Morphology, syntax, word order, cases.
Shared sounds and phoneme inventory.
Latin → Latin
Tupian ↔ Austronesian
The 5 languages with the lowest linguistic distance from Guarani:
A quick 3-question check between Guarani and Tagalog. No signup.