The majority of Catalonians didn't support independence in 2017, at most only 50% were in favor according to opinion polls. They only won the vote because most people ignored it (barely 43% even turned up…). When the referendum was held in Lithuania 93% voted in favor, in 1990 124 out of 141 MPs in parliament voted for independence (including almost all communist MPs). So I don't think the situations are really comparable that much.