Yes, ten minutes would be enough, as long as you get prepared well.
: Leave your KODAMA seat, look at your NOZOMI ticket, confirm the car number, etc.
Being elderly with limited mobility this is great news. Each train consists of 16 cars.
You have to walk long, for example,
from Car No. 16 of KODAMA to Car No. 4 of NOZOMI.
When you reserve your seats,
you can choose cars which are close to each other.
- Japan Guide: Tokaido Shinkansen
https://www.japan-guide.com/e/e2018_tokaido.htmlwe have to change to NOZOMI 357 (depart 13.47 ) NOZOMI 357 (for Shin-Osaka) does not run daily.
NOZOMI 31 (for Hakata), which runs daily,
is scheduled to depart a little later, from Track 17.
KOODAMA 719: arrive 13.37, Track 17: every day.
NOZOMI 357: depart 13.47, Track 16: specific days.
NOZOMI 31: depart 13.49, Track 17: every day.
- Map of Nagoya Station
https://global.jr-central.co.jp/en/info/station/_img/nagoya.jpg: Shinkansen Car No. 1 is close to the west end.