Valencian is another name for the same language as Catalan. Those who disagree do so for political reasons, not actual linguistic reasons.

Some sentences in both "languages" and English. Catalan/Valencian/English

Bon dia/Bon dia/Good morning

Avui fa bon temps/Hui fa bon temps/The weather is good today

Volem acabar amb la COVID19/Volem acabar amb la COVID19/We want to end COVID19

Sembla que plourà/Pareix que plourà/Looks like it's going to rain.

There are two difrent words in 4 sentences. I can't really see how that makes them separate languages.