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How many layers do each have one how many smart object object layers with embedded objects the are copies of other files. Size and resolution is only a small factor. Content is the biggest factor. Even without smart object images compress varies bat image content. Not by Numbers of Pixels in a image. There is also metadata, 30MB would seem very big if you have only one image. However the image may have megabytes of old history metadata.
If you dupe the large PSD as many times as it has layers and delete different layers in each save them you may fine one layer is causing the bulk of the file size. If all save 30 MB I would suspect ancestor metadata.
Thank you for the tip JJMack,
I notice the larger PSD has a very messy raw data code, while the smaller file size is clean and simple.
I have uploaded the two PSDs online, PSD.zip - Google Drive
Can anyone tell me how to clean up the raw data to reduce the file size.