Is reforming and isomerization the same thing? Okay, just to give an idea of my current understanding. Reforming is a step one can do after one has cracked some hydrocarbons. As such, the process of reforming is dependent on a separate process, cracking. What it involves is cracking the hydrocarbons, then putting them together in new ways, whilst still having the same chemical formula. In a sense, one is reversing the work done by the cracking, since that is a process that changes the chemical formula, however, when one puts the molecules back together, one changes them structurally. Basically, one is making isomers.
However, I do wonder if reformation also includes the saturation of hydrocarbons; as in, making alkenes and alkynes into alkanes. This obviously requires cracking, since double and triple bonds must be broken down into single bonds. If this is a part of reformation, that would mean the term applies to a wider process than just making isomers, since an alkane cannot be an isomer of an alkene/alkyne.
Perhaps isomerization is the creation of isomers, but within any field of chemistry, whereas reforming applies specifically to petrochemistry?
TL;DR: Isomerization is a subpart of reforming process. There are four major reforming reactions. Isomerization is one of them.

Reforming is a processing technique by which the molecular structure of a hydrocarbon is rearranged to alter its properties. The process is frequently applied to low-quality gasoline stocks to improve their octane number and thereby improving combustion.
There are four major types of reforming process:

Dehydrogenation of naphthenes



Dehydrogenation and aromatization of paraffins to aromatics (dehydrocyclization)



Hydrocracking of paraffins



Isomerization of normal paraffins to isoparaffins


You can see that during all the process except isomerization, there is a loss of atoms either carbon or hydrogen. However, there is no change of atoms during isomerization process.