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Just to clarify:
The difference in magnification between a 25mm eyepiece and a 10mm eyepiece is equal to 25/10 = 2.5x. The image in the 10mm will be 2.5x bigger than the image in the 25mm.
The difference between 10mm and 6mm = 10/6 = 1.67x. The image in the 6mm will be 1.67x bigger than in the 10mm.
The difference between 25mm and 6mm = 25/6 = 4.17x. The image in the 6mm will be 4.17x bigger than in the 25mm.
If the apparent field of the eyepieces is the same the the object will have less surround around it as you go higher in magnification. If the eyepiece apparent field is different then you could have a situation whereby the same amount of surround is visible with the 6mm as with the 10mm even though the overall size of everything is bigger. This could occur if for example say the the 10mm had a 50 deg apparent field and the 6mm had an 82 deg apparent field.
Now given your 6mm is about the same size as your 10mm I would say you have a Plossl and the apparent fields are the same. The extra weight is probably the better glass in the 6mm also giving you a better image.
If you look more closely you should see the image through the 6mm to be just over one and a half times (1.67x) bigger than the 10mm.
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