File size of single WAV vs. sum of 2 WAVs after splitting???

This isn’t a pressing problem, I’d just like to understand what’s going on. I hope I can explain this in a way that isn’t confusing.

I have a single WAV file that is comprised of the last 2 songs of a CD. The file size is 159,030,524 bytes if I do any of the following:

  1. Use EAC to rip these 2 tracks as 1 using ‘copy as range’
  2. Edit the cue sheet so that EAC splits them off as a single track from the master WAV file
  3. Rip them as individual tracks and then append one to the other.

Question #1: As individual tracks, their combined file size is 159,030,568 bytes, 44 bytes more than when they’re seen as a single track. Why is this? Does it have to do with 1 header vs. 2 ?

Question #2: If I take the single WAV file that is the union of these 2 songs and split it with Audacity by picking the split point and doing a cut & paste, the combined file size of the 2 individual tracks is the same as mentioned above in the first question, 159,030,568 bytes. This ‘makes sense’ to me that it would be the same. HOWEVER - the same isn’t true if I split the WAV by using Audacity’s ‘label method’ where you add labels to multiple parts of a WAV and then do an ‘Export Multiple.’ When split this way, the combined file size of the 2 individual tracks is 159,030,724 bytes… an additional 156 bytes more than mentioned in the first question, and 200 bytes more than when the 2 files are seen as 1. What happens with this ‘labels method’ that makes the individual file sizes larger?

My guess is that it is due to headers. I’ve never looked into this because a couple of hundred bytes is insignificant compared to hundreds of millions. If you are interested in perusing this you could open the files in a Hex editor (search on line for a free one if you don’t already have one). WAV is a type of “RIFF” file