It is Manjushri Bodhisattva.
Ksitigarbha Bodhisattva statues generally have two images:
One is wearing a Vairocana crown (generally a Bodhisattva wears a crown, clothes, necklaces and armbands) , showing the appearance of gods and humans), holding a staff in his right hand, holding a mani bead or bowl in his left hand, sitting in full lotus position on the lotus throne, or half lotus position on the listening divine beast.
The other is the appearance of a monk, which is the image of a monk, holding a staff in his right hand, a Mani bead in his left hand, and wearing a cassock.
All Buddhas and Bodhisattvas are the same. Many great Bodhisattvas, including Ksitigarbha Bodhisattva, have actually become Buddhas long ago and appear as Bodhisattvas to save and transform sentient beings.
I’m not sure what you mean by “making offerings to Ksitigarbha Bodhisattva”. Is it “making offerings to Ksitigarbha Bodhisattva”? Don’t blame those who don’t know. Besides, all Buddhas and Bodhisattvas in the ten directions and three times are the same. At most, you just called the Bodhisattva by the wrong name at the time, and you can change it later.
Of all offerings, Dharma offerings are the best. You learn the words and deeds of Buddhas and Bodhisattvas, do what the Bodhisattvas say, name them, read scriptures and recite mantras, strictly observe the five precepts and ten good deeds, and practice diligently. This is the real offering, and the rest are just superficial methods.
The real offering to Ksitigarbha Bodhisattva is to chant the holy name often, follow the instructions in the Ksitigarbha Sutra, do good deeds and be filial, and make great wishes to save all living beings.