What a superb photo and yes, you are right - It is a Eupanacra.hawkmoth.
Wikipedia confirms presence of Eupanacra mydon in India, but does not show pictures of the caterpillar. If you look at - https://www.inaturalist.org/taxa/326786-Eupanacra-mydon/browse_photos.... you will see many photos of the caterpillar.
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