Is Undertale Sans from Deltarune's World?

Is Sans from Undertale the same Sans as in Deltarune? This Deltarune theory has been floating around since 2018, and today I discuss its evidence, its holes

Stream [Undertale/Deltarune AU] [An Undyne THE WORLD REVOLVING] A Whirlpool Of Willpower by Moonstriker Expansion Pack +

SANS IS A DARKNER Undertale + Deltarune Theory

More evidence that sans is from the world of Deltarune! : r/Undertale

Games like Undertale that subvert and surprise

Hometown (Chapter 1) - Deltarune Guide - IGN

Undertale's Toby Fox gives a tantalizing Deltarune update

Still got that sweater. — SANS IS FROM. DELTARUNE

Undertale and Deltarune Cursor Collection - Custom Cursor

How Sans's lab could indicate a connection between him and the Deltarune world. I recommend checking out video Is Sans a Darkner? by Two Left Thumbs, which brought up many other pieces

deltarune theories ahoy — Sans is a Darkner Theory (MASTERPOST)

How Sans' Appearance in Deltarune Opens Connections to Undertale

Puns won't get you very far in this world., Deltarune

And people still say sans isn't a darkner : r/Deltarune

Deltarune The Seven Souls (Demo) at DELTARUNE Nexus - Mods and Community