There are at least 10 explicit references to the Four Immeasuable Minds in the Ksitigarbha 10 Wheels Sutra. This is from analysis of the Chinese version of Xuanzang (https://cbetaonline.dila.edu.tw/zh/T0411)

Four Brahma Viharas (四梵住) 3

四種梵住 2 (This variation, with 種, is also found in the Large Sutra on the Perfection of Wisdom)

梵住 1

慈悲喜捨 2 (listing the individual “minds”)

大慈大悲大喜大捨 2 (the same list, but with 大 preceding each “mind”)

Four Immeasurable Minds (四無量心) Zero