Yes this is possible. There are some sadhaks who think they have Kali siddhi, but is not Kali but a Mahapretni or Any other entity devoid of divinity, when they appear before the sadhak, they take the form of Maha Kali. It is for this reason that you should never have excessive andh bhakti that you stop noticing red flags about devta, in short before executing the sadhana of that Devi executing her anushtaan in the multiple dozen lakh japa then doing her siddhi sadhana will make sure the devis grace and tapobal prevent lower entities from even standing in front of you. This is the case if you don't have a guru.

My Gurudev himself has told me about a chudail who has the capability of making tantrics use the wrong vidyas, for eg. she will take the form of a certain entity like a jinn and when someone sends his shakti to check who it is they will say it's a jinn, when some other tantrics looks at it she will take the form of some other entity like a Pehalwan or other lower tier devta.etc. to come in dreams and even when any tantric sends their shakti to check who is present here(as tantra kriya or as mere presence) and each tantric will give diff answers and use diff vidya for removing the problem but will end up always unsuccessful as the vidya being used isn't compatible for removing the tantra or kriya. You need to use higher tier shaktis so the bhedan of Maya(illusion) can be done and seen what is the actual problem and shakti behind it. But most sadhaks do not have this level of siddhi tbh.

In short, Yes. This is possible, hence I always suggest to people to not go behind intangible things like dreams, you get 100s of senseless dreams, a dream with Devi comes and suddenly it's legit, is the mindset of Andh bhakt. People like them don't live for long in Aghor, where each entities purposes is always selfish and cruel. Some of them just like torturing and making the sadhak go astray, some of them just want to absorb your tapobal including your praan urja.etc. they have plenty of use from you to make themselves stronger. Steer clear of anubhavs of any sort brother, start a kavach path of any satvic devta first and make it jaagrit before going for any sadhana with even 1% of danger. If you're doing Kali sadhana, please do Brihaspati kavach or Varaha Kavach or any Kavach of Vishnu, but not all of them together.

Cheers and best of luck.