File Size for Rasterized vs. Smart Object Images

Hello,
I am scaling smaller images up to the full canvas size for a project (around 200% of original size). I have tried scaling images up as both a smart object, and also converting it to a rasterized layer, then scaling it up. I noticed that almost every time I leave the image a smart object and then scale the image up and save it for web, it is a smaller filesize than if I would convert it to a rasterized layer and then save it for web (sometimes up to 5% smaller). Does anyone know why this happens, or if it is changing the quality of the image by leaving it as a smart object?
Note: I am using very large images, with an original filesize of 1-3 MB.
Thanks for the help!

EDIT: Just to clarify, I am talking about the JPEG image file size being smaller, not the PSD file size
I do have maximum compatibiliy set for my PSD.
I am saving out all my images for this experiment out as a JPEG at 50% quality. I attached a screenshot of my save for web settings.
I also attached the rasterized image and the smart object image. I also attached the scaled down version of the image, which is what I am scaling up to create the rasterized and smart object images. Let me know if this is what you need to fully examine, and thank you for the help!
Here is the rasterized image:
Here is the smart object image:
Here is the scaled down verison of the image:
My Save for Web settings:

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<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
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Provider
[ Name]
Microsoft-Windows-Kernel-EventTracing
[ Guid]
{B675EC37-BDB6-4648-BC92-F3FDC74D3CA2}
EventID
2
Version
0
Level
2
Task
2
Opcode
12
Keywords
0x8000000000000010
TimeCreated
[ SystemTime]
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EventRecordID
25
Correlation
Execution
[ ProcessID]
4
[ ThreadID]
48
Channel
Microsoft-Windows-Kernel-EventTracing/Admin
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Daddy-PC
Security
[ UserID]
S-1-5-18
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SessionName
Circular Kernel Context Logger
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ErrorCode
3221225525
LoggingMode
268436608
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File Size for Rasterized vs. Smart Object Images

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