they are not the same. One is a non imm o-a multi entry visa obtained via a Thai Embassy or Consulate in one’s home country. The other is an extension of stay based on retirement obtained via Immigration in Thailand.
As you probably know you can basically get a second year by doing a border run just prior to the enter before date on the visa. After that point you have a couple of options. You could go back to your home country and apply for a new non imm o-a multi entry visa, or you can apply for an extension of stay based on retirement here in Thailand.
after your enter before date passes, you will have another year based on your most recent reentry date. That said you must purchase a reentry permit prior to exiting the country.
the enter before date/enter prior to date stamped on the original visa is the key date to determine your options. I suspect that date may have already passed.
One obtains a second year on a non imm o-a multi entry visa (that was originally obtained via a Thai Embassy or a Consulate in one’s home country) by leaving Thailand and returning before the enter prior to date stamped on the visa, with no additional funds requirements. After that second year, one applies for an extension of stay based on retirement via one’s local immigration office, and must meet the income/money in the bank requirements. I suspect that you are not really talking about a non imm o-a visa.