Fonts of the text can be Replaced to another font without changing the font size. This option can be
accessed using 'Format -> Replace Fonts' from the menu bar. Replace Fonts in Microsoft Powerpoint 2002
Description:
In the above example, the fonts of the text is Replaced from Arial to Comic Sans MS.
The font size of the text remains unchanged.
The fonts can be replaced by choosing your desired font type in a simple way.