Brand-to-brand size at a fixed US label — matched by foot length (cm), not guesswork.
Two charts · cm matchConverse US 10 maps to about 27.4 cm on that brand’s chart. The nearest Vans row at that length is US 10 / EU 44.
Same chart cm can still feel different on foot. Read the guides:
Converse: Chuck Taylor All Star High (runs big) · Chuck 70 High (runs big)
Vans: Old Skool (true to size) · Authentic (true to size) · Classic Slip-On (true to size)