Difference between IPA Sizes

What can be the possible reasons for the IPA size differences observed from the archived IPA vs the App Store connect reported for the same device variant ?

While generating the archive below options are enabled to generate the archive. We are observing a difference of approximately 6 MB, where the IPA size read from the App-thinning.plist has a higher value.

<key>compileBitcode</key>
<true/>
<key>uploadBitcode</key>
<false/>
<key>uploadSymbols</key>
<false/>
<key>destination</key>
<string>export</string>
<key>method</key>
<string>development</string>
<key>signingCertificate</key>
<string>Apple Development</string>
<key>signingStyle</key>
<string>manual</string>
<key>stripSwiftSymbols</key>
<true/>
<key>thinning</key>
<string>iPhone10,1</string>
Difference between IPA Sizes
 
 
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